Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(5): 293-303 (2019)


鉱物混合による土壌のセシウム保持能の向上に対する土壌有機物の影響Effect of Soil Organic Matter on the Enhancement of Caesium Fixation by Soil Mixed with Minerals

1岩手大学大学院総合科学研究科Graduate school of Arts and Science, Iwate University ◇ 020–8551 岩手県盛岡市上田4–3–5 ◇ 4–3–5 Ueda, Morioka, Iwate 020–8551, Japan

2東京水道サービス株式会社Tokyo Waterworks Service Co. ◇ 161–0023 東京都新宿区西新宿6–14–1 ◇ 6–14–1 Nishi-Shinjuku, Shinjuku, Tokyo 161–0023, Japan

3岩手大学理工学部Faculty of Science and Engineering, Iwate University ◇ 020–8551 岩手県盛岡市上田4–3–5 ◇ 4–3–5 Ueda, Morioka, Iwate 020–8551, Japan

受付日:2018年7月10日Received: July 10, 2018
受理日:2018年12月6日Accepted: December 6, 2018
発行日:2019年5月15日Published: May 15, 2019


Wastes containing high concentrations of radiocaesium released from the Fukushima Dai-ichi Nuclear Power Plant have been disposed in controlled landfill sites. In these landfill sites, soil layers were installed around the waste to prevent leaching of radiocaesium from the waste via precipitation. The objective of this study was to enhance Cs retention in the soil layers by mixing clay minerals. In andosol and brown forest soil, the amount of Cs fixed in the soil increased with the mineral mixing ratio; however, the amount of Cs fixed in gray lowland soil was independent of the mineral mixing ratio. In addition, the inhibition of Cs sorption by organic matter dissolved from each soil was examined by comparing the estimated amount with the actual amount of sorbed Cs. The obtained results suggest that the inhibition of Cs sorption onto clay minerals mixed with soil occurred due to the organic matter sorbed by the minerals.

Key words: Fukushima Dai-ichi Nuclear Power Plant Accident; radiocaesium; sorption; soil; mineral; DOM (Dissolved Organic Matter); landfill leachate

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